smtr: Fork smtlib for rosette

backends/functional/Makefile.inc

@@ -1,3 +1,4 @@
 OBJS += backends/functional/cxx.o
 OBJS += backends/functional/smtlib.o
+OBJS += backends/functional/smtlib_rosette.o
 OBJS += backends/functional/test_generic.o

backends/functional/smtlib_rosette.cc

@@ -0,0 +1,303 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2024  Emily Schmidt <[email protected]>
+ *  Copyright (C) 2024 National Technology and Engineering Solutions of Sandia, LLC
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/functional.h"
+#include "kernel/yosys.h"
+#include "kernel/sexpr.h"
+#include <ctype.h>
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+using SExprUtil::list;
+
+const char *reserved_keywords[] = {
+	// reserved keywords from the racket spec
+	"struct", "lambda", "values", "extract", "concat", "bv", "let", "define", "cons", "list", "read", "write",
+	"stream", "error", "raise", "exit", "for", "for/list", "begin", "when", "unless", "module", "require",
+	"provide", "apply", "if", "cond", "even", "odd", "any", "and", "or", "match", "match-define", "values",
+
+	// reserved for our own purposes
+	"inputs", "state", "name",
+	nullptr
+};
+
+struct SmtrScope : public Functional::Scope<int> {
+	SmtrScope() {
+		for(const char **p = reserved_keywords; *p != nullptr; p++)
+			reserve(*p);
+	}
+	bool is_character_legal(char c, int index) override {
+		return isascii(c) && (isalpha(c) || (isdigit(c) && index > 0) || strchr("~!@$%^&*_-+=<>.?/", c));
+	}
+};
+
+struct SmtrSort {
+	Functional::Sort sort;
+	SmtrSort(Functional::Sort sort) : sort(sort) {}
+	SExpr to_sexpr() const {
+		if(sort.is_memory()) {
+			return list("list", list("bitvector", sort.addr_width()), list("bitvector", sort.data_width()));
+		} else if(sort.is_signal()) {
+			return list("bitvector", sort.width());
+		} else {
+			log_error("unknown sort");
+		}
+	}
+};
+
+class SmtrStruct {
+	struct Field {
+		SmtrSort sort;
+		std::string accessor;
+		std::string name;
+	};
+	idict<IdString> field_names;
+	vector<Field> fields;
+	SmtrScope &scope;
+public:
+	std::string name;
+	SmtrStruct(std::string name, SmtrScope &scope) : scope(scope), name(name) {}
+	void insert(IdString field_name, SmtrSort sort) {
+		field_names(field_name);
+		auto base_name = RTLIL::unescape_id(field_name);
+		auto accessor = name + "-" + base_name;
+		scope.reserve(accessor);
+		fields.emplace_back(Field{sort, accessor, base_name});
+	}
+	void write_definition(SExprWriter &w) {
+		vector<SExpr> field_list;
+		for(const auto &field : fields) {
+			field_list.emplace_back(field.name);
+		}
+		w.push();
+		w.open(list("struct", name, field_list, "#:transparent"));
+		if (field_names.size()) {
+			for (const auto &field : fields) {
+				auto bv_type = field.sort.to_sexpr();
+				w.comment(field.name + " " + bv_type.to_string());
+			}
+		}
+		w.pop();
+	}
+	template<typename Fn> void write_value(SExprWriter &w, Fn fn) {
+		w.open(list(name));
+		for(auto field_name : field_names) {
+			w << fn(field_name);
+			w.comment(RTLIL::unescape_id(field_name), true);
+		}
+		w.close();
+	}
+	SExpr access(SExpr record, IdString name) {
+		size_t i = field_names.at(name);
+		return list(fields[i].accessor, std::move(record));
+	}
+};
+
+std::string smt_const(RTLIL::Const const &c) {
+	std::string s = "#b";
+	for(int i = c.size(); i-- > 0; )
+		s += c[i] == State::S1 ? '1' : '0';
+	return s;
+}
+
+struct SmtrPrintVisitor : public Functional::AbstractVisitor<SExpr> {
+	using Node = Functional::Node;
+	std::function<SExpr(Node)> n;
+	SmtrStruct &input_struct;
+	SmtrStruct &state_struct;
+
+	SmtrPrintVisitor(SmtrStruct &input_struct, SmtrStruct &state_struct) : input_struct(input_struct), state_struct(state_struct) {}
+
+	SExpr from_bool(SExpr &&arg) {
+		return list("bool->bitvector", std::move(arg));
+	}
+	SExpr to_bool(SExpr &&arg) {
+		return list("bitvector->bool", std::move(arg));
+	}
+	SExpr to_list(SExpr &&arg) {
+		return list("bitvector->bits", std::move(arg));
+	}
+
+	SExpr buf(Node, Node a) override { return n(a); }
+	SExpr slice(Node, Node a, int offset, int out_width) override { return list("extract", offset + out_width - 1, offset, n(a)); }
+	SExpr zero_extend(Node, Node a, int out_width) override { return list("zero-extend", n(a), list("bitvector", out_width)); }
+	SExpr sign_extend(Node, Node a, int out_width) override { return list("sign-extend", n(a), list("bitvector", out_width)); }
+	SExpr concat(Node, Node a, Node b) override { return list("concat", n(b), n(a)); }
+	SExpr add(Node, Node a, Node b) override { return list("bvadd", n(a), n(b)); }
+	SExpr sub(Node, Node a, Node b) override { return list("bvsub", n(a), n(b)); }
+	SExpr mul(Node, Node a, Node b) override { return list("bvmul", n(a), n(b)); }
+	SExpr unsigned_div(Node, Node a, Node b) override { return list("bvudiv", n(a), n(b)); }
+	SExpr unsigned_mod(Node, Node a, Node b) override { return list("bvurem", n(a), n(b)); }
+	SExpr bitwise_and(Node, Node a, Node b) override { return list("bvand", n(a), n(b)); }
+	SExpr bitwise_or(Node, Node a, Node b) override { return list("bvor", n(a), n(b)); }
+	SExpr bitwise_xor(Node, Node a, Node b) override { return list("bvxor", n(a), n(b)); }
+	SExpr bitwise_not(Node, Node a) override { return list("bvnot", n(a)); }
+	SExpr unary_minus(Node, Node a) override { return list("bvneg", n(a)); }
+	SExpr reduce_and(Node, Node a) override { return list("apply", "bvand", to_list(n(a))); }
+	SExpr reduce_or(Node, Node a) override { return list("apply", "bvor", to_list(n(a))); }
+	SExpr reduce_xor(Node, Node a) override { return list("apply", "bvxor", to_list(n(a))); }
+	SExpr equal(Node, Node a, Node b) override { return from_bool(list("bveq", n(a), n(b))); }
+	SExpr not_equal(Node, Node a, Node b) override { return from_bool(list("not", list("bveq", n(a), n(b)))); }
+	SExpr signed_greater_than(Node, Node a, Node b) override { return from_bool(list("bvsgt", n(a), n(b))); }
+	SExpr signed_greater_equal(Node, Node a, Node b) override { return from_bool(list("bvsge", n(a), n(b))); }
+	SExpr unsigned_greater_than(Node, Node a, Node b) override { return from_bool(list("bvugt", n(a), n(b))); }
+	SExpr unsigned_greater_equal(Node, Node a, Node b) override { return from_bool(list("bvuge", n(a), n(b))); }
+
+	SExpr extend(SExpr &&a, int in_width, int out_width) {
+		if(in_width < out_width)
+			return list("zero-extend", std::move(a), list("bitvector", out_width));
+		else
+			return std::move(a);
+	}
+	SExpr logical_shift_left(Node, Node a, Node b) override { return list("bvshl", n(a), extend(n(b), b.width(), a.width())); }
+	SExpr logical_shift_right(Node, Node a, Node b) override { return list("bvlshr", n(a), extend(n(b), b.width(), a.width())); }
+	SExpr arithmetic_shift_right(Node, Node a, Node b) override { return list("bvashr", n(a), extend(n(b), b.width(), a.width())); }
+	SExpr mux(Node, Node a, Node b, Node s) override { return list("if", to_bool(n(s)), n(b), n(a)); }
+	SExpr constant(Node, RTLIL::Const const& value) override { return list("bv", smt_const(value), value.size()); }
+	SExpr memory_read(Node, Node mem, Node addr) override { return list("list-ref-bv", n(mem), n(addr)); }
+	SExpr memory_write(Node, Node mem, Node addr, Node data) override { return list("list-set-bv", n(mem), n(addr), n(data)); }
+
+	SExpr input(Node, IdString name, IdString kind) override { log_assert(kind == ID($input)); return input_struct.access("inputs", name); }
+	SExpr state(Node, IdString name, IdString kind) override { log_assert(kind == ID($state)); return state_struct.access("state", name); }
+};
+
+struct SmtrModule {
+	Functional::IR ir;
+	SmtrScope scope;
+	std::string name;
+
+	SmtrStruct input_struct;
+	SmtrStruct output_struct;
+	SmtrStruct state_struct;
+
+	SmtrModule(Module *module)
+		: ir(Functional::IR::from_module(module))
+		, scope()
+		, name(scope.unique_name(module->name))
+		, input_struct(scope.unique_name(module->name.str() + "_Inputs"), scope)
+		, output_struct(scope.unique_name(module->name.str() + "_Outputs"), scope)
+		, state_struct(scope.unique_name(module->name.str() + "_State"), scope)
+	{
+		scope.reserve(name + "_initial");
+		for (auto input : ir.inputs())
+			input_struct.insert(input->name, input->sort);
+		for (auto output : ir.outputs())
+			output_struct.insert(output->name, output->sort);
+		for (auto state : ir.states())
+			state_struct.insert(state->name, state->sort);
+	}
+
+	void write(std::ostream &out)
+	{    
+		SExprWriter w(out);
+
+		input_struct.write_definition(w);
+		output_struct.write_definition(w);
+		state_struct.write_definition(w);
+
+		w.push();
+		w.open(list("define", list(name, "inputs", "state")));
+		auto inlined = [&](Functional::Node n) {
+			return n.fn() == Functional::Fn::constant;
+		};
+		SmtrPrintVisitor visitor(input_struct, state_struct);
+		auto node_to_sexpr = [&](Functional::Node n) -> SExpr {
+			if(inlined(n))
+				return n.visit(visitor);
+			else
+				return scope(n.id(), n.name());
+		};
+		visitor.n = node_to_sexpr;
+		for(auto n : ir)
+			if(!inlined(n)) {
+				w.open(list("let", list(list(node_to_sexpr(n), n.visit(visitor)))), false);
+				w.comment(SmtrSort(n.sort()).to_sexpr().to_string(), true);
+			}
+		w.open(list("cons"));
+		output_struct.write_value(w, [&](IdString name) { return node_to_sexpr(ir.output(name).value()); });
+		state_struct.write_value(w, [&](IdString name) { return node_to_sexpr(ir.state(name).next_value()); });
+		w.pop();
+
+		w.push();
+		auto initial = name + "_initial";
+		w.open(list("define", initial));
+		w.open(list(state_struct.name));
+		for (auto state : ir.states()) {
+			if (state->sort.is_signal())
+				w << list("bv", smt_const(state->initial_value_signal()), state->sort.width());
+			else if (state->sort.is_memory()) {
+				const auto &contents = state->initial_value_memory();
+				w.open(list("list"));
+				for(int i = 0; i < 1<<state->sort.addr_width(); i++) {
+					w << list("bv", smt_const(contents[i]), state->sort.data_width());
+				}
+				w.close();
+			}
+		}
+		w.pop();
+	}
+};
+
+struct FunctionalSmtrBackend : public Backend {
+	FunctionalSmtrBackend() : Backend("functional_rosette", "Generate Rosette compatible Racket from Functional IR") {}
+
+    	void help() override {
+        	//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    write_functional_rosette [options] [selection] [filename]\n");
+		log("\n");
+		log("Functional Rosette Backend.\n");
+		log("\n");
+		log("    -provides\n");
+		log("        include 'provide' statement(s) for loading output as a module\n");
+		log("\n");
+	}
+
+	void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
+	{
+		auto provides = false;
+
+		log_header(design, "Executing Functional Rosette Backend.\n");
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++)
+		{
+			if (args[argidx] == "-provides")
+				provides = true;
+			else
+				break;
+		}
+		extra_args(f, filename, args, argidx);
+
+		*f << "#lang rosette\n";
+		if (provides) {
+			*f << "(provide (all-defined-out))\n";
+		}
+
+		for (auto module : design->selected_modules()) {
+			log("Processing module `%s`.\n", module->name.c_str());
+			SmtrModule smtr(module);
+			smtr.write(*f);
+		}
+	}
+} FunctionalSmtrBackend;
+
+PRIVATE_NAMESPACE_END